Woohoo!! Another July traveler!!
I love Disney in the summer, crowds and heat be darned!
I applaud you on the hair and nail front...my Disney hair involves prayer and hair elastics. I can leave my hair down for a total of 10 minutes at Disney World, lol.
I am surprised at how many are not traveling in July this year! I am use to seeing MASSIVE amounts of people heading to the world in July but this year...I can't find many AT ALL! Especially those who want to participate in the "Pay it Forward" thread I started for my resort.
Now, as far as my hair goes, last year when we went in July I had much shorter hair and I went with my husband who swore to me that, that trip would be his last to Disney, but he went because it was just the two of us and we also went to Universal and he LOVES Universal. Half the crowds of Disney - Just sayin'! Even on opening week for Diagon Alley - wait times were like 12 - 20 minutes MAX (except for the diagon alley Escape from Gregots ride - 4-5 HOURS!

YIKES!!
Here was my hair on my last trip:
However, with the heat and my hair being twice as thick and twice as LONG...it may be that I end up putting my hair up in a "poof" pony tail and leave long strands of hair hanging around my fat face to try and "hide" that a bit...but then again, it may just end up in one big pony tail too! I know I did not wear my hair like this ALL DAY. After a few photos like this one, we rode water rides and such and of course, the hair went up. I do rely on my sun glasses as a "headband" so that did help me with my hair quite a bit. I could place my sunglasses up and move the hair out of my face inside and keep the hair back behind my ears. When out doors, this was the effect. Hair clips are a wonderful tool too! (If your husband doesn't squish them in his draw string backpack and break them!)
Hopefully this year I have some luck and get at least one good photo with the kids with my hair looking decent. If not, the pony tail wins, but a girl's got to try!